Preview
Source Code
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<!-- This script got from www.devanswer.com -->
<style>
/* Header */
.large-header {
position: relative;
width: 100%;
background: #333;
overflow: hidden;
background-size: cover;
background-position: center center;
z-index: 1;
}
#large-header {
background-image: url("http://devanswer.com/img/demo-1-bg.jpg");
}
.main-title {
position: absolute;
margin: 0;
padding: 0;
color: #f9f1e9;
text-align: center;
top: 50%;
left: 50%;
-webkit-transform: translate3d(-50%, -50%, 0);
transform: translate3d(-50%, -50%, 0);
}
.demo-1 .main-title {
text-transform: uppercase;
font-size: 4.2em;
letter-spacing: 0.1em;
}
.main-title .thin {
font-weight: 200;
}
@media only screen and (max-width: 768px) {
.demo-1 .main-title {
font-size: 3em;
}
}
</style>
</head>
<body>
<link href='https://fonts.googleapis.com/css?family=Raleway:200,400,800' rel='stylesheet' type='text/css'>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/5.0.0/normalize.min.css">
<link rel='stylesheet' href='http://devanswer.com/codes/files/demo.css'>
<script src='http://devanswer.com/codes/files/EasePack.min.js'></script>
<script src='http://devanswer.com/codes/files/rAF.js'></script>
<script src='http://devanswer.com/codes/files/TweenLite.min.js'></script>
<div id="large-header" class="large-header">
<canvas id="demo-canvas"></canvas>
<h1 class="main-title">Connect <span class="thin">Three</span></h1>
</div>
<div id="bcl"><a style="font-size:8pt;text-decoration:none;" href="http://www.devanswer.com">Developers Answer</a></div>
<script>
(function () {
var width, height, largeHeader, canvas, ctx, points, target, animateHeader = true;
// Main
initHeader();
initAnimation();
addListeners();
function initHeader() {
width = window.innerWidth;
height = window.innerHeight;
target = { x: width / 2, y: height / 2 };
largeHeader = document.getElementById('large-header');
largeHeader.style.height = height + 'px';
canvas = document.getElementById('demo-canvas');
canvas.width = width;
canvas.height = height;
ctx = canvas.getContext('2d');
// create points
points = [];
for (var x = 0; x < width; x = x + width / 20) {
for (var y = 0; y < height; y = y + height / 20) {
var px = x + Math.random() * width / 20;
var py = y + Math.random() * height / 20;
var p = { x: px, originX: px, y: py, originY: py };
points.push(p);
}
}
// for each point find the 5 closest points
for (var i = 0; i < points.length; i++) {
var closest = [];
var p1 = points[i];
for (var j = 0; j < points.length; j++) {
var p2 = points[j]
if (!(p1 == p2)) {
var placed = false;
for (var k = 0; k < 5; k++) {
if (!placed) {
if (closest[k] == undefined) {
closest[k] = p2;
placed = true;
}
}
}
for (var k = 0; k < 5; k++) {
if (!placed) {
if (getDistance(p1, p2) < getDistance(p1, closest[k])) {
closest[k] = p2;
placed = true;
}
}
}
}
}
p1.closest = closest;
}
// assign a circle to each point
for (var i in points) {
var c = new Circle(points[i], 2 + Math.random() * 2, 'rgba(255,255,255,0.3)');
points[i].circle = c;
}
}
// Event handling
function addListeners() {
if (!('ontouchstart' in window)) {
window.addEventListener('mousemove', mouseMove);
}
window.addEventListener('scroll', scrollCheck);
window.addEventListener('resize', resize);
}
function mouseMove(e) {
var posx = posy = 0;
if (e.pageX || e.pageY) {
posx = e.pageX;
posy = e.pageY;
}
else if (e.clientX || e.clientY) {
posx = e.clientX + document.body.scrollLeft + document.documentElement.scrollLeft;
posy = e.clientY + document.body.scrollTop + document.documentElement.scrollTop;
}
target.x = posx;
target.y = posy;
}
function scrollCheck() {
if (document.body.scrollTop > height) animateHeader = false;
else animateHeader = true;
}
function resize() {
width = window.innerWidth;
height = window.innerHeight;
largeHeader.style.height = height + 'px';
canvas.width = width;
canvas.height = height;
}
// animation
function initAnimation() {
animate();
for (var i in points) {
shiftPoint(points[i]);
}
}
function animate() {
if (animateHeader) {
ctx.clearRect(0, 0, width, height);
for (var i in points) {
// detect points in range
if (Math.abs(getDistance(target, points[i])) < 4000) {
points[i].active = 0.3;
points[i].circle.active = 0.6;
} else if (Math.abs(getDistance(target, points[i])) < 20000) {
points[i].active = 0.1;
points[i].circle.active = 0.3;
} else if (Math.abs(getDistance(target, points[i])) < 40000) {
points[i].active = 0.02;
points[i].circle.active = 0.1;
} else {
points[i].active = 0;
points[i].circle.active = 0;
}
drawLines(points[i]);
points[i].circle.draw();
}
}
requestAnimationFrame(animate);
}
function shiftPoint(p) {
TweenLite.to(p, 1 + 1 * Math.random(), {
x: p.originX - 50 + Math.random() * 100,
y: p.originY - 50 + Math.random() * 100, ease: Circ.easeInOut,
onComplete: function () {
shiftPoint(p);
}
});
}
// Canvas manipulation
function drawLines(p) {
if (!p.active) return;
for (var i in p.closest) {
ctx.beginPath();
ctx.moveTo(p.x, p.y);
ctx.lineTo(p.closest[i].x, p.closest[i].y);
ctx.strokeStyle = 'rgba(156,217,249,' + p.active + ')';
ctx.stroke();
}
}
function Circle(pos, rad, color) {
var _this = this;
// constructor
(function () {
_this.pos = pos || null;
_this.radius = rad || null;
_this.color = color || null;
})();
this.draw = function () {
if (!_this.active) return;
ctx.beginPath();
ctx.arc(_this.pos.x, _this.pos.y, _this.radius, 0, 2 * Math.PI, false);
ctx.fillStyle = 'rgba(156,217,249,' + _this.active + ')';
ctx.fill();
};
}
// Util
function getDistance(p1, p2) {
return Math.pow(p1.x - p2.x, 2) + Math.pow(p1.y - p2.y, 2);
}
})();
</script>
</body>
</html>
